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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef930179bb85646614acbe5c2ae18f016a2498041036ab75d26d6bf506d18cf5' 
  AND token = '3442S59bD0d0TzMOPpGoPym4jJNl6z70jYlIm34p188=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}